Ternary polymer alloys of polypropylene (PP) and polyethylene (PE) were prepared in different percent compositions. Polypropylene was used with three types of polyethylene including LLDPE, HDPE and LDPE. The samples (A-J) were fabricated using injection molding in semi industry scale. Charpy impact, tensile and shore (D) hardness tests were employed to study on the mechanical properties of the samples. Results showed that the highest improved impact strength of 100% were obtained for sample H for both notched and unnotched alloys. In addition, the highest elongation percent and breaking stress were observed for sample D while the highest hardness was belonged to sample H. Addition of PE to PP increased the toughness while it showed a little negative effect on hardness of the sample. It also increased elongation percent to more than 100%.

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